One of my favorite local get-a-way locations is Bodega Bay. It makes a great place for a relaxing day trip. Take a Friday off of work and drive there in the morning. Enjoy the view and make a stop at the beach! Have lunch at the Boat House restaurant. http://www.sonomacounty.com/restaurants/boat-house The BBQ oysters, clam chowder, fish and chips are the best!
After that, head to the UC Davis Bodega Bay Marine laboratory. http://bml.ucdavis.edu/ They have tours on most Fridays from 2:00pm to 4:00pm. It is a wonderful experience for the whole family!